Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781b6eeb9e5f7c0…

MALICIOUS

PDF

35.9 KB Created: 2021-06-21 12:21:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-20
MD5: b132167977ad0920d959a02f41088206 SHA-1: 09382161616e092e24e8c4ec46141a5c17e11e1e SHA-256: 4781b6eeb9e5f7c0cb9b89d8106397b749e93cab0b42cb256bb63194559364e5
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.co/app/406889139/coin-master-free-coins-link-2021-deutsch-game-hack In PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/client-minecraft_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/coin-monster_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/tiktok-free-views-and-likes_GM835599320.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/flee-the-facility-roblox-hack-exploit-gui_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/tiktok-free-view-iphone-7-plus_GM835599320.pdfIn PDF document text
    • https://s4sbrochure.org.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003389.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3389 23032 bytes
SHA-256: 5be9cdcfd86891b002c47c8556953c86fb444d0ac0e846305fc027721edeef66
font_01_sfnt_off0000676c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676C 19044 bytes
SHA-256: 2844f756ddbcc4a04a8e584fba3bd9ee643c4403cf9fe90d32670bab9c0c39f1

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